Lock



April 27,1926. 1,582,789

- J. F. SCHMAUK LOCK ' Filed Sept. 1, 1925 ATroRNEYS.

Apr. 27, 1926.

UNITED STATES PATENT OFFICE.

JOHN F. SCI-IMAUK, OF GLENSIDE, PENNSYLVANIA, ASSIGNOR T0 FLETCHER WORKS,

INCORPORATED, 0F PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENN- SYL'VANIA.

LOCK.

Application filed September 1, 1925. Serial No. 53,773.

T 0 all whom it m ay concern Be it known that 1, JOHN F. SCHMAUK, a citizen of the United States, and a resident of Glenside, in the county of Montgomery and State of Pennsylvania, have invented a certain new and useful Improvement in Locks, of which the following is a specification.

My invention relates to an improvement in safety locks adapted for application to devices wherein it is necessary or desirable to prevent access to the moving member while the same is in motion.

My invention is particularly well adapted for use on centrifugals in which it is necessary or desirable to lock the cover of the centrifugal in place to prevent access to the basket of the centrifugal while the latter is being rotated.

It is to be understood, however, that the application of my improved device is not limited to centrifugals buthas other uses as well, as will be apparent to those skilled in the art and from the detailed description which follows.

In the accompanying drawings I have illustrated an embodiment of my invention applied to the cover of a centrifugal;

Fig. 1 being a sectional elevational view of part of a centrifugal with my improved locking mechanism applied thereto and shown in plane elevation;

Fig. 2 is a section taken on the line while Fig. 3 shows the position taken by a part and particularly the locking hook of my improved, device when the centrifugal basket or other moving part is in motion.

Referring to the drawings in detail, 1 designates the basket of a centrifugal which it will be understood is rotatable on a vertical axis, 2 designates the tub of the centrifugal which it will be understood is stationary, while 3 designates a hinged cover for the centrifugal and which it is desired to lock to the tub in closed position.

The inside of the cover 3 is provided with two brackets or projections 4.- and 5, respectively, and to the bracket 4 I pivot an op erating lever 6 the upper end of which extends through a slot provided for that purpose in the cover 8 where it is equipped wi h a h ndle or n b wh re y h l e may be rotated about its pivot. Screwed into or otherwise attached to the lower end of the lever 6 is a short stud 8 on which is pivoted a hook-carrying member 9 adaptcd to rotate on this stud but held in the position of Fig. 1 so far as rotation on the stud 8 is concerned by means of a spring 10.

The member 9 carries at one end, the left hand end as viewed in Fig. 1, a roller 11 adapted under certain conditions to engage the upper face of the centrifugal basket 1. Normally, however, this roller is free of the basket as shown in Fig. 1. The memher 9 also carries a hook, boltor keeper 12, the hooked end 13 of which is adapted to engage a hook 14; pivoted on the bracket 5 by means of a stud 15. The latch 14; is adapted to engage or hook under the underside of a strip 16 secured to the tub 2.

The latch 14: carries a short lever 17 which in turn is provided with a spring 18, one end of which is attached to the lever 6. This arrangement is provided so as to normally hold the lever 6 in the posi- 4 tion of Fig. 1 with the roller 11 out of contact with the centrifugal basket.

It will be seen from the foregoing that in order to unlock the cover 3 it becomes necessary to actuate the latch 14 so as to disengage the same from the'lock-strip 16. It will be apparent that by moving the handle or knob 7 to the right as viewed in Fig. 1, to move the lower end of the lever 6 to the left as viewed in the same figure so as to carry the hook 13 on the member 12 to the left also. in engagement with the latch 14, continued movement of the lever 6 will carry the latch out of latching position. This is actually the operation of the device when the centrifugal basket is stationary.

Assuming that the basket 1, however, is rotating and that an attempt be made to unlock the cover 3:

In this case movement of the lower end of the lever 6 to the left will carry the roller 11 into engagement with the face of the basket 1 and inasmuch as the same is rotating the roller 11 will be pushed toone side in the direction of rotation of the basket so as to carry the hook 13 on the member 12 out of line entirely with the latch 14: so that any further movement of the lever 6 to the left will merely carry the hook 13 to the left without, however, in any way actuating the latch 14-, and consequently the cover remains locked in closed position.

It will be seen from the foregoing, therefore, that I have provided a locking mechanism adapted for application to centrifugals, for instance, by which a stationary member may be locked in position and cannot be released or unlocked until amevable member co-operating with the stationary member has come to rest.

It is to be understood that changes may be made, in the details of construction and arrangement of parts herein illustrated and described within the purview of my invention.

hat I claim is:

1. A. safety lock for centrifugals COH'lPl'lS- ing in combination a keeper, a lock controlling rod, and keeper controlling means carried by said rod and adapted when said rod is actuated to move said keeper out of locking position when the centrifugal is at rest, said keeper controlling means when the centrifugal is rotating being moved by the cen trifugal upon operation of the rod to nonoperative position.

2. In a centrifugal comprising a cover and a rotary basket, a lock for the cover comprising a latch, a lever operable from the exterior of the cover, means carried by said lever beneath said cover for co-operation with said latch to release the same, and a roller arried by said lever and adapted to engage the surface of said basket when the lever is operated to release the latch, whereby when the basket is rotating said latch will be held in locking position.

3. In a centrifugal, the combination of acover, a tub, means for locking the cover to the tub, and comprising in combination a latch adapted to engage the tub beneath said i c ver, a lever pivoted on the underside of said cover and extending through the cover to be operable from the exterior thereof, a hook carried by said lever and adapted to engage said latch when the lever is operated to release the same to thereby unlock the cover.

August, 199.5.

In a centrifugal comprising a cover and a rotatable basket, a latch carried by the cover and adapted to hold the cover in locked position, a lever pivoted on the underside of said cover, a hook pivoted on said lever, a roller fixed relatively to said hook and adapted to engage the surface of said basket when the lever is operated, whereby when the basket is rotating the hook will be caused to rotate on said lever to carr the same out of releasing position relatively to said latch to prevent unlocking of said cover.

5. A centrifugal comprising a centrifugal basket and a cover therefor, a tub, a latch pivoted on the underside of said cover and adapted to engage the said tub to prevent movement of the cover, a lever pivoted on the underside ot'isaid cover, a hook pivoted on said lever and adapted under predetermined conditions to engage said latch, a roller carried by said lever and fixed relatively to said hook, said roller when said lever is rocked on its pivot being adapted to engage the surface of said basket, whereby when the basket is rotating said hook will be carried out of cooperative position rela tively to said latch.

6.21 centrifugal comprising a cover, a bracket on the underside of said cover, a lever pivoted to said bracket and having an operating portion extending through the cover to the exterior thereof, a second bracket on the underside of said cover, a latch pivoted on said last mentioned bracket and engageable with, the tub of the centrifugaha hook-carrying member pivotally mounted on said lever, a spring for maintaining said hook-carrying member in a predetermined position, a hook carried by said member and engageable with said latch, a centrifugal basket and a roller mounted on said hook-carrying member and engageable when said lever is operated with said basket, whereby when the basket is rotating the said hook will be moved out of co-operative relation with said latch.

This specification signed this 21st day of JOHN F. SGHMAUK. 

